<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #d1{
            width: 100px;
            height: 100px;
            border: 1px solid red;
/*            margin-left: 100px;
            margin-top: 100px;*/
 /*           margin-bottom:  100px;*/
            margin: 50px 100px 75px 85px;
        }
        #d2{
           width: 100px;height: 100px;border: 1px solid red;
        }
        #s1{
            /*行内元素上下外边距无效*/
            margin-right: 100px;
        }
        #s2{
            margin-left: 50px;
        }
        #big{
            width: 200px;height: 200px;background-color: green;
            overflow: hidden;
        }
        #big>div{
            width: 50px;height: 50px;background-color: red;
            margin-left: 50px;
            margin-top: 50px;

        }
        #border_div{
            width: 200px;
            height: 200px;
            border: 10px solid blue;
            border-radius: 110px;
        }
    </style>
</head>
<body>
<div id="border_div"></div>
<div id="big">
    <div></div>
</div>
<span id="s1">span1</span>
<span id="s2">span2</span>
<div id="d1">外边距测试</div>
<div id="d2">div2</div>
</body>
</html>